Google Reveals ‘Half-Double’ Technique for Exploiting Rowhammer in DDR4

A seven-year-old flaw in DRAM chips is making another comeback. Google revealed this week that

A seven-year-old flaw in DRAM chips is making another comeback. Google revealed this week that it’s discovered a new technique, Half-Double, that can be used to exploit the Rowhammer bug thought to have been fixed with the release of DDR4.

Rowhammer was discovered in 2014 when researchers showed that it was possible to manipulate data stored in DDR3 memory by repeatedly accessing (“hammering”) a single row of memory cells to cause bit flips in adjacent rows.